diff --git a/libs/langgraph/langgraph/pregel/loop.py b/libs/langgraph/langgraph/pregel/loop.py
index ad75921d3..644fd5a68 100644
--- a/libs/langgraph/langgraph/pregel/loop.py
+++ b/libs/langgraph/langgraph/pregel/loop.py
@@ -286,7 +286,7 @@ class PregelLoop(LoopProtocol):
             )
         else:
             self.checkpoint_config = self.config
-        if thread_id := config[CONF].get(CONFIG_KEY_THREAD_ID):
+        if thread_id := self.checkpoint_config[CONF].get(CONFIG_KEY_THREAD_ID):
             if not isinstance(thread_id, str):
                 self.checkpoint_config = patch_configurable(
                     self.checkpoint_config,
@@ -1050,16 +1050,16 @@ class SyncPregelLoop(PregelLoop, ContextManager):
             saved = None
         if saved is None:
             saved = CheckpointTuple(
-                self.config, empty_checkpoint(), {"step": -2}, None, []
+                self.checkpoint_config, empty_checkpoint(), {"step": -2}, None, []
             )
         elif self._migrate_checkpoint is not None:
             self._migrate_checkpoint(saved.checkpoint)
         self.checkpoint_config = {
-            **self.config,
+            **self.checkpoint_config,
             **saved.config,
             CONF: {
                 CONFIG_KEY_CHECKPOINT_NS: "",
-                **self.config.get(CONF, {}),
+                **self.checkpoint_config.get(CONF, {}),
                 **saved.config.get(CONF, {}),
             },
         }
@@ -1200,16 +1200,16 @@ class AsyncPregelLoop(PregelLoop, AsyncContextManager):
             saved = None
         if saved is None:
             saved = CheckpointTuple(
-                self.config, empty_checkpoint(), {"step": -2}, None, []
+                self.checkpoint_config, empty_checkpoint(), {"step": -2}, None, []
             )
         elif self._migrate_checkpoint is not None:
             self._migrate_checkpoint(saved.checkpoint)
         self.checkpoint_config = {
-            **self.config,
+            **self.checkpoint_config,
             **saved.config,
             CONF: {
                 CONFIG_KEY_CHECKPOINT_NS: "",
-                **self.config.get(CONF, {}),
+                **self.checkpoint_config.get(CONF, {}),
                 **saved.config.get(CONF, {}),
             },
         }
diff --git a/libs/langgraph/tests/test_pregel.py b/libs/langgraph/tests/test_pregel.py
index b79d569c5..27f05c074 100644
--- a/libs/langgraph/tests/test_pregel.py
+++ b/libs/langgraph/tests/test_pregel.py
@@ -6169,7 +6169,7 @@ def test_falsy_return_from_task(
                         "checkpoint_ns": "",
                         "thread_id": AnyStr(),
                     },
-                    "metadata": configurable["configurable"],
+                    "metadata": {},
                     "recursion_limit": 25,
                     "tags": [],
                 },
@@ -6177,7 +6177,6 @@ def test_falsy_return_from_task(
                     "parents": {},
                     "source": "input",
                     "step": -1,
-                    "thread_id": AnyStr(),
                     "writes": {
                         "__start__": {
                             "a": 5,
@@ -6268,6 +6267,7 @@ def test_falsy_return_from_task(
             "type": "task_result",
         },
     ]
+    print(type(configurable["configurable"]["thread_id"]))
     assert [
         c
         for c in graph.stream(Command(resume="123"), configurable, stream_mode="debug")
@@ -6281,7 +6281,7 @@ def test_falsy_return_from_task(
                         "checkpoint_ns": "",
                         "thread_id": AnyStr(),
                     },
-                    "metadata": configurable["configurable"],
+                    "metadata": {},
                     "recursion_limit": 25,
                     "tags": [],
                 },
@@ -6376,7 +6376,7 @@ def test_falsy_return_from_task(
                         "checkpoint_ns": "",
                         "thread_id": AnyStr(),
                     },
-                    "metadata": configurable["configurable"],
+                    "metadata": {},
                     "recursion_limit": 25,
                     "tags": [],
                 },
@@ -6384,7 +6384,6 @@ def test_falsy_return_from_task(
                     "parents": {},
                     "source": "loop",
                     "step": 0,
-                    "thread_id": AnyStr(),
                     "writes": {
                         "falsy_task": False,
                         "graph": None,
@@ -6398,7 +6397,7 @@ def test_falsy_return_from_task(
                         "checkpoint_ns": "",
                         "thread_id": AnyStr(),
                     },
-                    "metadata": configurable["configurable"],
+                    "metadata": {},
                     "recursion_limit": 25,
                     "tags": [],
                 },